HELP!!!!! Taigene motor load

[DPTeam270Driver]

srry if this was already discussed, but its kinda urgent.
we just started to test our arm and claw, but the Taigene motor doesnt hold the wieght. the motor doesnt lock and is slipping. is there away to program the speed controler to have it lock or something we did wrong w/ the motor.
can anyone tell me how to fix it or is this supposed to happen???
is anyone else having the same problem???
(just our wrist is about 6lbs)
if anyone can help plz hurry
we NEED this done b/c our program mentor is comin and we need a complete robot

-team 270

[TubaMorg]

We had the same problem. You would hope that the worm gear would keep it from backdriving, but it doesn't. So we went with the Keyang instead. Programming won't help "lock" it. You are talking about running the motor at a stall (just enough voltage to stop the movement), which is never a good idea. Think about a design mod to solve your problem. Teams in the past with this sort of problem have added in a locking mechanism (like a brake). Or you can try the Keyang motors, they don't backdrive.

Good luck!

[JimWright949]

Have you tried to put your Victor into Brake mode? The doc:
http://www.ifirobotics.com/docs/ifi-...al-9-25-06.pdf
should help you with this.

-Jim
PS Fans! Use lots of fans on this Victor and motor!

[esisso]

we ran into this problem....its messy to try and create a brake..change the motor...we went through 3 different prototypes..the first with a fisher price and the other with the taigene motor and the third with a taigene motor and a brake....the arm just got too heavy

[jgannon]

Originally Posted by JimWright949

Have you tried to put your Victor into Brake mode?

Just for the sake of clarity, remember that while using Brake mode will cause your motors to slow down more abruptly, it will not prevent your motor from backdriving. If you want to prevent backdrive, you'll either need to add an encoder and control it in software, add a mechanical brake, or use a motor with a worm gear (such as the Denso).

[popo308]

Originally Posted by jgannon

Just for the sake of clarity, remember that while using Brake mode will cause your motors to slow down more abruptly, it will not prevent your motor from backdriving. If you want to prevent backdrive, you'll either need to add an encoder and control it in software, add a mechanical brake, or use a motor with a worm gear (such as the Denso).

last year our arm back drove sometimes and when it was on brake it completely stopped back drving....

[waialua359]

we are familiar with your problem since we encountered the same problem about a week and a half ago. The taigene worm gear inside is all plastic and fine, thus unable to hold in place.
Our solution was two-fold. We used a larger gear ratio to pivot our arm and used springs and frame stop points to smooth the flow.
The main thing is design. Our design eliminates the problem of whether the arm can move or not once a load is present. It doesnt matter for our robot.

The same thing will happen with the window motor, however a double step reduction eliminated any arm movement problems on our second joint. The double reduction eliminated the need for such a huge sprocket at the top of our arm joint, keeping us within design dimensions.

[DPTeam270Driver]

Thank you to those of you who suggested things
team 270 appreciates the help

- team 270

[bhsrobotics1671]

just a note*
there is an Allen screw on the side of the motor and when you tighten the screw it will keep it from falling.

we have ran into some issues with the plastic teeth in the inside of the motor braking off. up to 5-10 teeth in a row. we had all the specs looked up and planned out and we did the calculations to only find that we are only using 60% of each motor (on on each side of our arm mechanism)

if any other teams have experienced this problem and have a solution and would share that would be greatly appreciated, if you could, please PM me your reply.

[Joe G.]

Does anyone have any estimates on how much load it takes for this to occur? We were planning on using the taigene motor for our elevator (haven't run the whole thing yet) with a 4" spool to reel in the cable. How much weight do you think this will support before backdriving?

[Mark Holschuh]

We are also using the Taigene motor to operate our lift and also noticed that it slips when we try to hold with the the trackball up. Does anyone know how much load it takes to start failing the plastic teeth?

[T3_1565]

Originally Posted by Mark Holschuh

We are also using the Taigene motor to operate our lift and also noticed that it slips when we try to hold with the the trackball up. Does anyone know how much load it takes to start failing the plastic teeth?

what kind of reduction are you using?? cause I'm sure it will help, we are about to test tomorrow if our arm can lift the ball up and we have a double stage reduction of about 4:1 and it can carry a 10 pound weight pretty easily

I don't have any numbers for you, but I'm pretty sure reductions can fix any problems you might be having!!

[bhsrobotics1671]

we wern't even lifting the ball and we have two motors on each side of the ball, calculated to be working at about 60% of what they could and they blew in no time for us, moved up and down about 5 times and you can just hear when the teeth of the plastic gears pop off.

i will try to get our gear specs and what not to share with everyone, for now here are some pictures.

[T3_1565]

are we even allowed two of those motors?? maybe they worked against eachother??? cause we haven't had a problem with ours yet and we are only using one motor. can you show whats on the end of your arm (weight wise and leverage)

[bhsrobotics1671]

i havnt read anything saying we cant, but if anyone says that we cant, please send me a rule number so that i can look into it.




sorry thats all i have right now..
anyways the whole arm structure from where it mounts to the base (including motors, shafts, and gears) weighs 40lbs.